PMRT-nomogram | Department of Surgery

PMRT Calculator

Post-Mastectomy Radiation Treatment Probability Calculator

This is a web calculator to estimate someone’s probability of needing Post Mastectomy Radiation Treatment (PMRT), before pathology results are available.

To use this calculator, fill in the pre-operative information about the patient to calculate the probability of PMRT.

Note: for each risk factor below, the average value among our patient cohort will be used by default, unless you enter a value (i.e., if a risk factor is missing, the average value in the dataset used to construct this calculator will be used).

We display the factors in the order of decreasing importance found by the model.

Calculator Form

Note: if the information is missing or unknown, leave input blank

Presence of metastatic carcinoma on axillary lymph node biopsy

Histology subtype is Ductal Carcinoma In Situ (DCIS)

Presence of pre-operative palpable axillary lymph node

HER status

Maximum dimension/size of pre-operative tumor on any imaging modality
(measured in mm)

Histology subtype is Invasive Ductal Carcinoma (IDC)

Maximum size of pre-operative suspicious lymph node on any imaging modality
(measured in mm; enter 0 if there is no pre-operative suspicious LN)

Pre-operative biopsy method used

Initial diagnostic imaging modality is ultrasound

Lymphovascular invasion

Age at diagnosis (years)

ER status